Answer
{$1;2;3;4;5;6;7;8$}
Work Step by Step
The union of two sets consists of the elements that are in the first set, in the second set or in both sets:
{$2;4;6;8$}}$\cup${$1;3;5;7$}$=${$1;2;3;4;5;6;7;8$}
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